TM 55-1510-222-10
c.
Blank space resulting from the deletion of
text, an illustration or a table.
d.
Correction of minor inaccuracies, such as
spelling, punctuation, relocation of material, etc., unless
correction
changes
the
meaning
of
instructive
information and procedures.
1-11. AIRCRAFT DESIGNATION SYSTEM.
The designation system prescribed by AR 70-50 is
used in aircraft designations as follows:
EXAMPLE RC-12K
R
-
Modified
mission
symbol
(Reconnaissance)
C
-
Basic mission and type symbol
(Cargo)
12 -
Design number
K
-
Series symbol
1-12. USE OF WORDS SHALL, WILL, SHOULD, AND
MAY.
Within this technical manual the word "shall" is
used to indicate a mandatory requirement. The word
"should" is used to indicate a nonmandatory but
preferred method of accomplishment. The word "may"
is
used
to
indicate
an
acceptable
method
of
accomplishment. The word "will" is used to express a
declaration of purpose and may also be used where
simple futurity is required.
1-13. PLACARD ITEMS.
Where applicable, placarded items (switches,
controls, etc.) are shown throughout this manual in
capital letters.
1-2
